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PostPosted: Fri Jan 09, 2004 3:19 pm 
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Joined: Fri Jan 09, 2004 2:56 pm
Posts: 5
Location: Hungary
I am in front of a big decision. Wich crankarm is better in weight/stiffness?
I heard that carbon arms (like FSA) are not too stiff.

FRM CU2-M TR ISIS / Race Face Next LP ISIS / FSA Carbon Pro Team ISIS

My bb decision is FRM's ISIS. Still not sure 113mm or 108 better for CrossCountry/Marathons. I know the official size for all of them is 113mm.

Please help me if you know any information!


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PostPosted: Fri Jan 09, 2004 4:50 pm 
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Joined: Wed Jul 09, 2003 6:27 pm
Posts: 301
Location: Karlsruhe (Germany)
If you've chosen the FRM bb Al-version you can take the crank of your choice without having a look at stiffness, cause the stiffest cranks don't make sense if you're loosing stiffness at the bb.

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PostPosted: Fri Jan 09, 2004 4:51 pm 
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Joined: Tue Nov 11, 2003 11:14 pm
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Location: Singapore
to find out the BB lenght. upright the BB and take a ruler and measure from bottom end to top end. If u wanna find out which one is the best crank , try and :shock: for www.mtbr.com

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PostPosted: Fri Jan 09, 2004 5:00 pm 
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elendil wrote:
If you've chosen the FRM bb Al-version you can take the crank of your choice without having a look at stiffness, cause the stiffest cranks don't make sense if you're loosing stiffness at the bb.


I disagree. Im using bontrager crank with xtr Un91 BB. I broke my left crank arm with a snap as i was struggling climbing up a steep slope.And the square BB work just fine.

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PostPosted: Fri Jan 09, 2004 6:06 pm 
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Location: Karlsruhe (Germany)
Ok, you broke it, but that doesn't have to do s.th. with stiffness. In most cases the stiffer the longer they last, but a flexy fork for example must not break. I was aiming for the "powerloss" caused by flexy crank arms, not for durability. So what I meant is:he won't feel a difference in stiffness between these crank arms because of the FRM bb with Al-axle, but I agree that some light crank arms don't last very long.

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